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प्रश्न
State whether the following is True or False.
Coal takes millions of years to form.
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
Name two sources of energy that you think are renewable. Give reason for your choice.
Name two sources of energy which you consider to be non-renewable. Give reason for your choice.
Why is LPG considered a good fuel?
Which fossil fuel formed by the buried remains of large land plants?
Coal cannot be converted into one of the following forms of energy. This is:
(a) coal gas
(b) electricity
(c) oil
(d) charcoal
Fill in the following blank with suitable word:
Tidal waves build up and recede ........... a day.
Which of the following sources of energy are not derived from the sun?
Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy
The world's known coal reserves are expected to last for about:
(a) 200 years
(b) 400 years
(c) 500 years
(d) 100 years
Answer the following question.
Write the name of the main constituent of Biogas. Also, state its percentage.
Fill in the blank
_______is the coal with the highest percentage of coal.
State whether the following is True or False.
Coal and petroleum are renewable energy resources.
State whether the following is True or False.
Renewable energy resources have limited supply in nature.
Give an account of the use of solar energy.
Can you tell?
What are the non-conventional energy resources?
Why are fossil fuels called non-renewable sources of energy?
Acid rain happens because ______.
Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
Some natural resources are given below. Classify them into the exhaustible and inexhaustible natural resources.
| air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen |
Complete the crossword in figure with the help of the clues:
Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
5. The substance obtained by carbonisation. (4)
6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
